Fits the von Bertalanffy growth equation to clustered length and age
by using nonlinear least-squares and by bootstrapping clusters

Usage

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Arguments

len

vector of lengths of individual fish

age

vector of ages of individual fish

cluster

haul or cluster membership identifier

nboot

number of bootstrap samples

control

see control under function nls.

Details

A standard von Bertalanffy growth curve is fitted to length-at-age data of each nboot sample of clusters
using nonlinear least-squares (function nls). The estimated parameters and their associated standard deviations
are calculated as the mean and variance of the estimates from all bootstrap fits. The average parameter correlation matrix
from all bootstrap fits is provided as well.

Value

List containing a summary of successful model fits and parameter estimates, standard deviation and
95 percent confidence intervals, and the average correlation matrix.